F: Mum, what do you think would be worse? If you fell onto the train tracks and hit your head BUT there were no trains coming for two hours ... OR ... If you were hit by a car but it didn't squash you?
Me: Well, which would hurt more? How badly would I be hit?
F: You wouldn't get hit AT ALL! The car would just sort of roll right OVER YOU.
Me: Oh. Well I guess I'd take the car.
F: Oh no, for me that's easy. It's THE TRAIN! I mean, there's no other one coming for TWO HOURS. So there's no way you'll get hit.
Me: Well, I thought, if you hit your head on the tracks, what if that knocks you unconscious and you're unconscious for the next two hours and then the train hits you anyway?
F pauses, thinking it over. 'I hadn't thought of THAT,' he says. 'You're right, I'd rather get hit by the car.'